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[APD] Re: substrates

"But then why do many Europeans and some
Americans love them? Can the explanation simply be that
those who have found them worthwhile live in colder climates
(colder rooms)? Cable heating would keep the roots growing
and working."

I think it's more to do with bacterial temps helping the tank do better, faster cycling.
But if you get a large difference inbetween the water and the sub, well you don't have enough flow to begin with.

"Without them would not a temperature difference
between the water coloumn and the root zone negatively
effect the growth of tropical plants? Has anyone tried
seeing how temperature differences between water coloumn and
rootzones effect growth? I know many horticulturist who
vouch that heating mats (bottom heat) are excellent for
terrestrial plant growth. There is no appreciable redox
involved and no nutrient flow, but plant roots 'love' the
warmth, and so the whole plant grows well."

Bacteria play a huge role, the dominant role in substrate in wetland systems.

"Too simple?

Tom Barr

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